From [Customize the system], open [Entities] - [Control], apply "Read-only Grid (default)" to the "Web", the view is displayed as usual. However, if applying "Editable Grid" to "Web", the view will look different.
Since End users usually use Dynamics 365 (online) on their mobile devices, it is very hard to look at and use it because of the display difference. It would be user-friendly if the view is the same as before when applying "Editable Grid" to the "Web".